libpysal.cg.fast_threshold¶

libpysal.cg.fast_threshold(pts, dist, radius=6371.0)[source]¶

Find all neighbors on a sphere within a threshold distance

Parameters:

Parameters:	pointslist : list of lat-lon tuples (Note, has to be a list, even for one point) dist: float threshold distance radius: float sphere’s radius
Returns:	dict: key is id of point, value is a list of ids for other points within dist of key point

pointslist : list of lat-lon tuples (Note, has to be a list, even for one point)

dist: float

threshold distance

radius: float

sphere’s radius

Returns:

dict:

key is id of point, value is a list of ids for other points within dist of key point